CN114134399B - Energy-saving steel wire rod with high bainite content for high alloy tool and manufacturing method thereof - Google Patents
Energy-saving steel wire rod with high bainite content for high alloy tool and manufacturing method thereof Download PDFInfo
- Publication number
- CN114134399B CN114134399B CN202110421668.3A CN202110421668A CN114134399B CN 114134399 B CN114134399 B CN 114134399B CN 202110421668 A CN202110421668 A CN 202110421668A CN 114134399 B CN114134399 B CN 114134399B
- Authority
- CN
- China
- Prior art keywords
- wire rod
- temperature
- cooling
- controlled
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to an energy-saving steel wire rod for a high-alloy tool with high bainite content, which comprises the following chemical components in percentage by mass: 0.60 to 0.75%, si:1.00 to 1.50%, mn:0.40 to 0.70%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, cr:0.10 to 0.50%, mo: 0.30-0.70%, V:0.15 to 0.30%, ni:0.05 to 0.40 percent of Fe and inevitable impurities in balance. The steel wire rod for preparing the high alloy tool with the high bainite content adopts a production process of KR molten iron pretreatment, converter smelting, LF refining, RH refining, continuous casting of square billets, heating, controlled rolling, water bath cooling and heat collection tunnel heat preservation. By adopting the processes of high-speed wire controlled rolling, water bath EDC controlled cooling and heat preservation of the heat collecting tunnel, the uniform high bainite content structure, low decarburized layer and high surface quality of the harness cord are obtained, the surface hardness, the wear resistance, the maximum working torque and the service life of the finished tool can be improved, and the economic and social benefits are good.
Description
Technical Field
The invention relates to an energy-saving steel wire rod with high bainite content for a high alloy tool and a manufacturing method thereof. Belongs to the technical field of ferrous metallurgy.
Background
The high-alloy tool steel wire rod is mainly used for manufacturing various high-end tool products such as electric screwdriver heads, hexagonal wrenches, superhard cross-shaped tools and the like, and has the special properties of long service life, high hardness, high toughness, high torque, wear resistance and the like. The high-end tool is processed by the combined processes of pickling, annealing, drawing, heat treatment, grinding and plating of the wire rod and the like, and the high-end tool bears complex stress such as load, vibration, bending torsion, impact and the like in the working process, and the corner angle of the high-end tool steel wire rod is required to be ensured not to be broken, deformed and have long service life in the working process, so that the requirements on the surface quality, decarburization, structure uniformity and the like of the high-alloy tool steel wire rod are strictly controlled.
The traditional control cooling production process of the high-alloy tool steel wire rod comprises a fan, a roller way, a heat-insulating cover and the like, wherein the fan is controlled by a stelmor cooling line, the speed of the roller way and the heat-insulating cover enable the tool steel wire rod to obtain a bainite structure with a higher proportion, but the traditional control cooling process cannot avoid the large temperature difference between the middle point and the lap joint point of the wire rod on the stelmor air cooling line, the structure of the wire rod is uneven, the martensite structure is easily generated locally, the brittle fracture of the wire rod is easily generated in transportation or storage, the defects can be found in the use of a client, the processing and the use of the client are seriously influenced, and the production rhythm of the client is influenced. The large-specification tool steel is also produced in a large coiling mode, the tool steel is enabled to pass through the control of the coiling temperature and the temperature of the heat preservation tunnel to enter and exit, the coiling tissue is changed into a sorbite tissue in the running time, the plasticity is good, the brittle failure is reduced, the decarburization requirement is neglected in the mode, high decarburization is brought, the surface hardness of the tool steel is low due to the high decarburization, edges and corners are broken in the working process, and the service life of the tool steel is greatly reduced due to the deformation.
Patent application No. CN105149878A and patent application No. CN103436687A disclose a production process and a controlled cooling process of a high alloy tool steel wire rod, which both enable the tool steel wire rod to obtain a martensite structure with a higher proportion, the final structure of the wire rod produced by the invention is martensite steel with poorer plasticity, the wire rod is easy to be brittle failure in transportation or storage, the defects can be found only when a customer uses the wire rod, the processing and use of the customer are seriously influenced, and the production rhythm of the customer is influenced.
Patent application No. CN109517968A discloses a production method of high plasticity tool steel wire rod, for big coiled production mode of big specification tool steel, make tool steel pass through control crimping temperature, the temperature of discrepancy heat preservation tunnel, travel time makes coiled tissue change into sorbite structure, the good brittle failure that reduces of plasticity, though this mode can solve the brittle failure problem but it has ignored the decarbonization requirement, must bring high decarbonization, high decarbonization can lead to tool steel surface hardness low, the during operation edges and corners are broken, it makes its life significantly reduce to warp.
Patent application No. CN111690801A discloses a production process of an alloy tool steel wire rod for obtaining an all-bainite structure, which is different in component design, and discloses an alloy tool steel wire rod for obtaining an all-bainite structure, which contains Nb: 0.010-0.025 percent, the Nb-containing steel inevitably brings crack risk, influences the surface quality of the Nb-containing steel, cannot bear complex stress such as vibration, bending torsion, impact and the like in the working process, and influences the fatigue life.
Disclosure of Invention
The invention aims to solve the technical problem of providing an energy-saving steel wire rod for a high-alloy tool with high bainite content and a manufacturing method thereof, aiming at the prior art, a novel process method of high-wire controlled rolling, water bath EDC controlled cooling and heat preservation of a heat collection tunnel is matched, the steel wire rod for the high-alloy tool produced by the method has high bainite content, uniform whole structure and difficult brittle fracture, is beneficial to spheroidizing annealing processing after a client, and ensures that the manufactured tool has high hardness, good wear resistance and long service life and is difficult to break, deform and slip at edges and corners during working due to high surface quality and low decarburized layer.
The technical scheme adopted by the invention for solving the problems is as follows: an energy-saving steel wire rod for a high alloy tool with high bainite content comprises the following chemical components in percentage by mass: 0.60 to 0.75%, si:1.00 to 1.50%, mn:0.40 to 0.70%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, cr:0.10 to 0.50%, mo: 0.30-0.70%, V:0.15 to 0.30%, ni:0.05 to 0.40 percent of Fe and inevitable impurities in balance.
The invention adopts a KR molten iron pretreatment, converter smelting, LF refining, RH refining, continuous casting of square billets, heating, controlled rolling, water bath cooling and heat collection tunnel heat preservation production process for preparing the high-bainite-content steel wire rod for the high-alloy tool. The core of the process scheme is that continuous casting square billets are used as raw materials, rolling control, water bath cooling control and heat collection tunnel heat preservation are carried out at a high speed line, and the process scheme comprises billet treatment, heating temperature control, initial rolling temperature control, final rolling temperature control, spinning temperature control, water bath cooling control after spinning and tunnel heat preservation control after heat collection.
The manufacturing method of the steel wire rod for the high-alloy tool comprises the following steps:
step one, selecting continuous casting square billets with proper specifications
The adopted specification is 150mm 2 -240mm 2 The surface of the continuous casting square billet is polished, and the surface quality of the billet is strictly controlled to meet the requirement.
Step two, heating treatment of continuous casting square billet
The heating temperature of the selected continuous casting square billet is strictly controlled before rolling, and decarburization is reduced as much as possible, namely the furnace temperature of the first section of the heating furnace is 800-900 ℃, the furnace temperature of the second section of the heating furnace is 900-1100 ℃, and the furnace temperature of the soaking section is 1000-1100 ℃.
Step three, rolling the continuous casting billet
Controlled rolling and controlled cooling are carried out on the heated continuous casting square billet, the rolling starting temperature is controlled to be 900-1050 ℃, the descaling pressure of high-pressure water is more than or equal to 18MPa, the finish rolling is carried out at 820-860 ℃, the finish rolled high-alloy tool steel is cooled by water, and the temperature is controlled to be 750-850 ℃ after the water cooling; after entering the reducing sizing mill for rolling, the spinning is carried out again through water cooling, and the spinning temperature is controlled to be 700-800 ℃. Through controlling high-speed large-deformation rolling in a recrystallization region and a two-phase region, an austenite structure deforms under the condition, grains continuously slide and rotate to generate deformation storage energy, and a phase change driving force is increased to shorten a phase change incubation period; meanwhile, through water cooling is matched to prevent austenite grains from growing again and refine the grains; the low-temperature spinning is controlled to shorten the phase change range, preparation is made for cold-controlled phase change, and the steel can be quickly transited into a bainite region for phase change.
Step four, controlled cooling after rolling
And after spinning, performing controlled cooling by adopting a 1# to 4# roller way of a water bath EDC cooling line. The roller speed is 0.30-0.6 m/s, the water temperature is controlled at 95-100 ℃, the water outlet temperature is controlled to 550-650 ℃, and the phase transformation region is rapidly transited from an austenite region to a bainite region. After the outlet water temperature is controlled to be between 550 and 650 ℃, direct heat collection is carried out, the wire rod is coiled and enters a heat preservation tunnel, the tunnel door is completely closed, the heat preservation phase change is carried out in a bainite region, the wire rod is cooled to about 400 ℃ and then is taken out of the tunnel for air cooling, so that the bainite content is improved, the surface decarburization is ultralow, the water bath EDC cooling is matched with the heat collection to ensure that the temperature of the whole wire rod is uniform, the structure is uniform, and therefore, the edges and corners of the finished tool are not crushed, deformed, slipped and the fatigue life is long when the finished tool works.
Compared with the prior art, the invention has the advantages that:
compared with the traditional rolling and stelmor air cooling process, the novel process has the advantages that the growth of austenite grains is restrained by low-temperature rolling, the grains are refined, the decarburization is reduced, the surface quality of a finished product is improved, the phase change range is shortened by low-temperature spinning, the EDC controlled cooling in water bath enters circulating boiling water for cooling by controlling the roller speed after the wire rod is spun, the circulating boiling water can contact with the wire rod without a dead angle by 100 percent, the efficient and uniform cooling can be kept under the constant cooling condition without fluctuation, the temperature difference between the lap joint point and the middle point of the wire rod is avoided, the wire rod is uniformly cooled, a better and more uniform internal microstructure is obtained, compared with the traditional fan cooling process, the product can obtain more uniform structure performance, a fine and compact grain structure is obtained, the generation amount of iron scales on the surface of the wire rod can be reduced, a client can easily remove the iron scale spheroidizing annealing, the long-time and long-distance tunnel heat preservation phase change of high-alloy tool steel in a bainite region phase change temperature region in the tunnel is fully guaranteed, and a uniform high bainite structure is obtained.
Drawings
FIG. 1, FIG. 2, FIG. 3 and FIG. 4 are schematic views of the hot rolled wire rod lap joint and the intermediate point metallographic structure (500X) produced in examples 1 to 3 of the present invention;
FIG. 5 is a graphical depiction of the metallurgical decarburization (500X) of hot rolled wire rods produced in examples 1-3 of the invention;
fig. 6 and 7 are views showing the overlapping point and the middle point metallographic structure (500X) of the hot rolled wire rod produced in comparative example 1 according to the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying examples and comparative examples.
The specification of the rolled wire rod is phi 8mm, and the chemical components are in mass percent engagement with C:0.71%, si:1.05%, mn:0.45%, P: less than or equal to 0.015%, S: less than or equal to 0.010%, cr:0.25%, mo:0.40%, V:0.20%, ni:0.15% of the balance Fe and inevitable impurities.
And (4) selecting continuous casting square billets for direct surface grinding treatment.
Controlling the heating temperature to prevent decarburization, namely controlling the furnace temperature of the first section of the heating furnace to be 850 ℃, the furnace temperature of the second section of the heating furnace to be 1000 ℃ and the furnace temperature of the soaking section to be 1050 ℃.
Controlling rolling process parameters, namely, controlling the starting rolling temperature to be 1000 ℃, the high-pressure water descaling pressure to be more than or equal to 18MPa, performing finish rolling at 850 ℃, cooling the finish-rolled high-alloy tool steel in water, and controlling the temperature to be 810 ℃ after cooling in water; after entering a reducing sizing mill for rolling, the steel wire is cooled again by water penetration, and the spinning temperature is 770 ℃.
And controlling cooling process parameters, and performing water circulation to control cooling by adopting a roller way of a water bath EDC cooling line. The speed of the 1# -4# roller way is 0.5m/s, the water temperature circulation is 99 ℃, and the water outlet temperature of each wire rod is between 560 ℃ and 580 ℃. And after the wire rod is discharged, directly and quickly collecting heat, after the wire rod is coiled, allowing the wire rod to enter a heat preservation tunnel, slowly driving in the heat preservation tunnel for continuously preserving heat, and discharging the wire rod out of the tunnel for air cooling when the temperature of the wire rod is cooled to 400 ℃.
Example 2
The specification of the rolled wire rod is phi 8mm, and the mass percentage of chemical components is C:0.71%, si:1.05%, mn:0.45%, P: less than or equal to 0.015%, s: less than or equal to 0.010%, cr:0.25%, mo:0.40%, V:0.20%, ni:0.15% and the balance of Fe and inevitable impurities.
And (4) selecting continuous casting square billets for direct surface grinding treatment.
Controlling the heating temperature to prevent decarburization, namely controlling the furnace temperature of the first section of the heating furnace at 880 ℃, the furnace temperature of the second section of the heating furnace at 1020 ℃ and the furnace temperature of the soaking section at 1070 ℃.
Controlling rolling process parameters, namely, the starting rolling temperature is 980 ℃, the high-pressure water descaling pressure is more than or equal to 18MPa, the finish rolling is carried out at 850 ℃, and the finish rolled high-alloy tool steel is cooled by water and the temperature is 820 ℃ after the water cooling; and (4) after entering a reducing sizing mill for rolling, carrying out water cooling again, wherein the spinning temperature is 780 ℃.
And controlling cooling process parameters, and performing water circulation to control cooling by adopting a roller way of a water bath EDC cooling line. The speed of the 1# -3# roller way is 0.5m/s, the water temperature circulation is 98 ℃, and the water outlet temperature of each wire rod is 565-580 ℃. After the wire rod is discharged, direct and rapid heat collection is carried out, the wire rod is coiled and enters the heat preservation tunnel, the heat preservation tunnel is driven slowly to keep heat preservation, and the wire rod is discharged from the tunnel for air cooling when the wire rod is cooled to 400 ℃.
Example 3
The specification of the rolled wire rod is phi 8mm, and the mass percentage of chemical components is C:0.71%, si:1.05%, mn:0.45%, P: less than or equal to 0.015 percent, S: less than or equal to 0.010%, cr:0.25%, mo:0.40%, V:0.20%, ni:0.15% and the balance of Fe and inevitable impurities.
And (3) selecting continuous casting square billets for direct surface grinding treatment.
Controlling the heating temperature to prevent decarburization, namely controlling the furnace temperature of the first section of the heating furnace at 880 ℃, the furnace temperature of the second section of the heating furnace at 1010 ℃ and the furnace temperature of the soaking section at 1080 ℃.
Controlling rolling process parameters, namely, the starting rolling temperature is 1020 ℃, the high-pressure water descaling pressure is more than or equal to 18MPa, the finish rolling is carried out at the temperature of 840 ℃, and the high-alloy tool steel after the finish rolling is cooled by water, and the temperature after the cooling by the water is 815 ℃; after entering a reducing sizing mill for rolling, the steel wire is cooled again by water penetration, and the spinning temperature is 770 ℃.
And controlling cooling process parameters, and performing controlled cooling by adopting a roller way of a water bath EDC cooling line and circulating boiling water. The speed of the 1# to 4# roller way is 0.5m/s, the water temperature is controlled to be 99 ℃ circularly, and the water outlet temperature of each wire rod is 550-575 ℃. And after the wire rod is discharged, directly and quickly collecting heat, after the wire rod is coiled, allowing the wire rod to enter a heat preservation tunnel, slowly driving in the heat preservation tunnel for continuously preserving heat, and discharging the wire rod out of the tunnel for air cooling when the temperature of the wire rod is cooled to 400 ℃.
FIG. 1, FIG. 2, FIG. 3 and FIG. 4 show the metallographic structure of the lap joint and the intermediate point in 1 turn of the hot rolled wire rod produced in examples 1 to 3 of the present invention, all being bainite structures, and the wire rod structure being uniform and having no martensite in part. FIG. 5 shows the metallurgical decarburization, low decarburization and good surface quality of the hot rolled wire rod produced in examples 1 to 3 of the present invention.
Comparative example 1
The specification of the rolled wire rod is phi 8mm, and the mass percentage of chemical components is C:0.71%, si:1.05%, mn:0.45%, P: less than or equal to 0.015 percent, S: less than or equal to 0.010%, cr:0.25%, mo:0.40%, V:0.20%, ni:0.15% of the balance Fe and inevitable impurities.
And (4) selecting continuous casting square billets for direct surface grinding treatment.
Controlling the heating temperature to prevent decarburization, namely controlling the furnace temperature of the first section of the heating furnace to be 850 ℃, the furnace temperature of the second section of the heating furnace to be 1000 ℃ and the furnace temperature of the soaking section to be 1050 ℃.
Controlling rolling process parameters, namely, controlling the starting rolling temperature to be 1000 ℃, the high-pressure water descaling pressure to be more than or equal to 18MPa, performing finish rolling at 850 ℃, cooling the finish-rolled high-alloy tool steel in water, and controlling the temperature to be 830 ℃ after cooling in water; and (4) after entering a reducing sizing mill for rolling, carrying out water cooling again, wherein the spinning temperature is 780 ℃.
And controlling cooling process parameters, and performing controlled cooling by adopting a roller way of a stelmor cooling line, a fan and a heat-insulating cover. The speed of the initial 1# roller way and the 2# roller way is 0.10m/s, and the subsequent roller ways are gradually increased by 0.01 to 0.02m/s; the No. 1-5 fan controls the air quantity to be 10% -25%, the heat preservation covers are opened for 5, and the rest heat preservation covers are closed completely and enter the heat preservation section. The temperature of the middle point of the wire rod entering the cover is 550 ℃, and the temperature of the lap joint point of the wire rod is 650 ℃. The steel wire rod enters a heat preservation cover for heat preservation, and when the steel wire rod is taken out of the cover, the temperature of the middle point of the steel wire rod is 450 ℃, but the temperature of the lap joint point of the steel wire rod is still 580-600 ℃.
FIG. 6 and FIG. 7 show the hot rolled wire rod lap joint and the intermediate point gold phase microstructure produced in comparative example 1 of the present invention.
Inventive examples 1 to 3 and comparative example 1 were examined for metallographic microstructure and the results are shown in Table 1.
TABLE 1
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Claims (3)
1. The manufacturing method of the energy-saving steel wire rod for the high alloy tool with the high bainite content is characterized by comprising the following steps of: the wire rod comprises the following chemical components in percentage by mass: 0.60 to 0.75%, si:1.00 to 1.50%, mn:0.40 to 0.70%, P: less than or equal to 0.020%, S: less than or equal to 0.020%, cr:0.10 to 0.50%, mo:0.30 to 0.70%, V:0.15 to 0.30%, ni:0.05 to 0.40 percent of Fe and inevitable impurities in balance; the method specifically comprises the following steps:
step one, selecting continuous casting square billets with proper specifications
The adopted specification is 150mm 2 -240mm 2 The continuous casting billet is subjected to surface polishing treatment;
step two, heating treatment of continuous casting square billet
Strictly controlling the heating temperature of the selected continuous casting square billet before rolling, and reducing decarburization as much as possible;
step three, rolling the continuous casting billet
Controlled rolling is carried out on the heated continuous casting square billet, the initial rolling temperature is controlled to be 900-1050 ℃, the high-pressure water descaling pressure is more than or equal to 18MPa, the finish rolling is carried out at 820-860 ℃, and the spinning temperature is controlled to be 700-800 ℃;
step four, controlled cooling after rolling
After spinning, performing controlled cooling by adopting a water bath EDC cooling line, performing controlled cooling on the water bath EDC, passing through a wire rod for spinning, and then entering circulating boiling water for cooling by controlling the roller speed, wherein the roller speed is 0.30 to 0.6m/s, the water temperature is controlled to be 95-100 ℃, the effluent temperature is controlled to be 550-650 ℃, and a phase change region is rapidly transited from an austenite region to a bainite region; after the outlet water temperature is controlled to be between 550 and 650 ℃, direct heat collection is carried out, the wire rods are coiled and enter a heat-preservation tunnel, the tunnel door is completely closed, the heat-preservation and phase change are carried out in a bainite region, the wire rods are cooled to about 400 ℃ and then are taken out of the tunnel for air cooling, and therefore the bainite content and the ultra-low decarburization on the surface are improved.
2. The method for manufacturing an energy-saving steel wire rod for a high alloy tool having an upper bainite content according to claim 1, wherein: during the heating treatment, the temperature of the first section of the heating furnace is 800-900 ℃, the temperature of the second section of the heating furnace is 900-1100 ℃, and the temperature of the soaking section is 1000-1100 ℃.
3. The method for manufacturing an energy-saving steel wire rod for a high alloy tool having an upper bainite content according to claim 1, wherein: after the continuous casting billet is finish-rolled, cooling in water is carried out, and the temperature is controlled to be 750-850 ℃ after cooling in water; and after entering a reducing sizing mill for rolling, carrying out water cooling again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110421668.3A CN114134399B (en) | 2021-04-19 | 2021-04-19 | Energy-saving steel wire rod with high bainite content for high alloy tool and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110421668.3A CN114134399B (en) | 2021-04-19 | 2021-04-19 | Energy-saving steel wire rod with high bainite content for high alloy tool and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114134399A CN114134399A (en) | 2022-03-04 |
| CN114134399B true CN114134399B (en) | 2022-12-16 |
Family
ID=80438595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110421668.3A Active CN114134399B (en) | 2021-04-19 | 2021-04-19 | Energy-saving steel wire rod with high bainite content for high alloy tool and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114134399B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855088A (en) * | 2022-05-25 | 2022-08-05 | 湖南华菱湘潭钢铁有限公司 | Production method for controlling depth of decarburized layer of tool steel wire rod |
| CN116145029B (en) * | 2022-12-22 | 2024-05-14 | 本钢板材股份有限公司 | Corrosion-resistant cutting tool steel and preparation method and application thereof |
| CN117051308A (en) * | 2023-08-24 | 2023-11-14 | 湖南华菱湘潭钢铁有限公司 | Production method of tool steel wire rod |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5331698B2 (en) * | 2006-10-11 | 2013-10-30 | ポスコ | Steel wire for spring with high strength and toughness excellent in cold workability, method for producing the steel wire, and method for producing a spring with the steel wire |
| CN108165716B (en) * | 2017-12-30 | 2019-07-19 | 江阴兴澄合金材料有限公司 | A kind of online EDC water-bath toughening processing method of high intensity bridge cable zinc-coated wire gren rod |
| CN111690801B (en) * | 2020-05-25 | 2021-11-02 | 中天钢铁集团有限公司 | Production process of alloy tool steel wire rod for obtaining full bainite structure |
| CN111872137B (en) * | 2020-07-07 | 2022-06-14 | 鞍钢股份有限公司 | Controlled cooling method for spring steel wire rod after rolling |
| CN112239803A (en) * | 2020-10-15 | 2021-01-19 | 中天钢铁集团有限公司 | Controlled rolling and controlled cooling method for reducing martensite in high alloy steel hot-rolled wire rod microstructure |
-
2021
- 2021-04-19 CN CN202110421668.3A patent/CN114134399B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114134399A (en) | 2022-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114134399B (en) | Energy-saving steel wire rod with high bainite content for high alloy tool and manufacturing method thereof | |
| CN104532126B (en) | A kind of super high strength hot rolled Q＆P steel of low yield strength ratio and its manufacture method | |
| CN113245365B (en) | Rolling production method for improving toughness of steel on line | |
| CN109402522B (en) | Hot-rolled wire rod for conditioning-free hot-dip galvanized bolt and production process thereof | |
| CN103966411B (en) | A kind of manufacture method of medium carbon cold heading steel Bar Wire Product | |
| CN110791717B (en) | High-quality hypoeutectoid alloy tool steel wire rod and production method thereof | |
| CN110180893A (en) | A kind of rolling mill practice for improving 38CrMoAl steel and rolling state tissue | |
| CN103350110A (en) | Method for manufacturing austenitic stainless steel band with smooth and bright surface | |
| CN111485086A (en) | Controlled rolling and cooling process for reducing decarburized layer depth of high-carbon alloy tool steel wire rod | |
| CN102251250B (en) | Rolling method for pickling line thermal annealing of low-chromium 400 series stainless steel | |
| CN114015847A (en) | Method for producing 45 steel for direct cutting by controlled rolling and controlled cooling process | |
| CN112090956A (en) | Production control method of wire rod for low-segregation high-torsion bridge cable | |
| CN110551880A (en) | softening heat treatment process for small-size 22Si2MnCrNi2MoA steel rolled material | |
| WO2022174530A1 (en) | Free-cutting and non-quenched and tempered steel, and manufacturing method therefor | |
| CN110935838B (en) | Roller processing method suitable for improving forging penetration and shortening heat treatment period | |
| CN108998730A (en) | A kind of hypereutectoid tool steel and its manufacturing method | |
| CN107443028A (en) | A kind of preparation method of high strength titanium alloy bar | |
| CN110860558B (en) | Rolling method of ultra-wide and ultra-thick steel containment nuclear power steel | |
| CN111842485A (en) | Heating method for reducing decarburization layer depth of aluminum alloy-containing structural steel wire rod | |
| CN107419174B (en) | Economical high-carbon steel and its manufacturing method | |
| CN114807552B (en) | Production method of spring steel hot-rolled wire rod | |
| CN114160572B (en) | Control method for pearlite colony at edge of carbon cold heading steel wire rod | |
| CN107419175B (en) | Economical tool steel with good fatigue life and production method thereof | |
| CN115430705A (en) | Production method of wire rod for high-strength bridge cable galvanized steel wire | |
| CN117339997A (en) | Rolling and cooling control method for producing middle and small-sized CrV spring steel hot rolled wire rod |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |